CVE-2026-102599

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{"affected": [{"affectedData": [{"product": "socket.io", "vendor": "socketio", "versions": [{"status": "affected", "version": ">= 6.6.0, < 6.6.10"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing the revision stored on the existing session. A malicious client can establish a valid session and send an upgrade request with a different or omitted EIO query parameter, attaching a transport with incompatible parser and heartbeat behavior. A crafted heartbeat packet can then trigger an uncaught exception and terminate the Node.js process, including when Engine.IO v3 compatibility is disabled because an omitted EIO value is interpreted as revision 3 on the affected path. This issue is fixed in Engine.IO 6.6.10."}], "id": "CVE-2026-102599", "lastModified": "2026-10-17T02:17:08.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-102599", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-17T00:39:37.132946Z", "version": "2.0.3"}}]}, "published": "2026-10-13T19:17:49.037", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729"}, {"source": "security-advisories@github.com", "url": "https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10"}, {"source": "security-advisories@github.com", "url": "https://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "engine.io: engine.io: Denial of Service via protocol revision mismatch during transport upgrade", "id": "2551068", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2551068"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-248", "details": ["A flaw was found in engine.io. A remote attacker can cause a Denial of Service (DoS) by establishing a valid session and sending a transport upgrade request with a mismatched or omitted protocol revision parameter. This discrepancy causes the server to attach incompatible communication handlers, allowing a subsequent crafted heartbeat packet to trigger an unhandled error and crash the application process."], "name": "CVE-2026-102599", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "grafana", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-gaudi-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/bootc-rocm-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Not affected", "package_name": "rhelai3/disk-image-cuda-rhel9", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana12.4", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.1", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "grafana13.2", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-13T19:05:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-102599\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-102599\nhttps://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729\nhttps://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10\nhttps://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.6.0,6.6.10)"}}], "enrichment": {"confidence": 94.0, "confidence_source": "matching", "scores": [{"score": 94.0, "source": "matching"}]}, "original": {"product": "socket.io", "source": "cna", "vendor": "socketio"}, "product": "socket.io", "vendor": "socket"}], "created": "2026-10-13T22:00:25.929744+00:00", "updated": "2026-10-19T14:03:23.150211+00:00", "vendors": ["socket", "socket$PRODUCT$socket.io"]}